Car truck



dim

Sept. 25, 1945. HAF 2,385,476

CAR TRUCK Filed June 7, 1943 2 Sheets-Sheet 1 INVENTQR I James 475171;-9

ATTORNEY Sept. 25, 1945.

2 Sheets-Sheet 2 Filed June 7, 1943 ATTORNEY Patented Sept. 25, 1945 CARTRUCK James A. Shafer, East Cleveland, Ohio, assignor to NationalMalleable and Steel Castings Company, Cleveland, Ohio,-a corporation ofOhio Application June '7, 1943, Serial No. 489,874 6 Claims. (01.105-197) The present invention is a modification of the type of truckdescribed and claimed in Shafer Patent No. 2,187,434, January 16, 1940,in which thebolster supporting springs are arranged on two levels, theupper springs being housed Within the bolster end and directlysupporting the bolster, and the lower springs being housed within theside frame and supporting the bolster through downwardly extendingtrunnions formed integrally with said bolster. In this type of truck,friction means are interposed between the lower springs and thetrunnions.

The present invention relates to trucks of increased spring capacitycapable of carrying heavier loads than the types of truck shown in theabove-mentioned patent.

In the drawings: I

Figure 1 is an elevational view of a car truck embodying my invention,one half of which is shown in vertical section.

Figure 2 is a horizontal sectional view, taken on line 22 of Figure 1.

Figure 3 is a vertical sectional view, taken on line 3-3 of Figure 1.

Figure 4 is an oblique view of the means for supporting one of thesprings and for locking down certain of the frictional parts.

Referring to the drawings, the side frame I is formed with a tensionmember I I, compression member l2 and connecting columns I3, I3. Thecentral portion I4 of tension member H is of box section having a bottomwall I5, side walls I6, I6 and a top wall or shelf I'I. Shelf I1 isformed with openings I8, I8 receiving the friction mechanism.

In the present invention two springs I9, I9 (preferably double coilsprings) are housed within the tension member II, seating upon thebottom wall I thereof, and three springs 20, 20, are housed within theend of bolster 2 I, thus providing a spring group consisting of livesprings. The three upper springs 20 are arranged side by side lengthwiseof the bolster 2I, the axis of the center one of these springscoinciding with the intersection of the center lines of bolster and sideframe. These three springs 20 bear at their upper ends against the topwall 22 of the bolster 2| and extend down through the open bottomportion of the bolster.

On each side of the center one of these springs is a trunnion 2 3integral with the bolster and extending downwardly therefrom, andthrough an opening I8 in shelf I I! of the side frame. The lower facesof these trunnions are beveled, as shown at 23a and 2311.

Cooperating with these beveled faces are wedges or friction shoes 24,there being two of these shoes for each trunnion. These shoes rest uponthe upper ends of the lower springs I9. The angular contact between thebolster trunnions and shoes, and the upward reaction of the springs I9forces each shoe outwardly against a hardened wear liner 25 which seatsin the opening I8 in the shelf portion ll of the side frame. Each ofthese wear liners 25 has an uninterrupted, preferably cylindrical, innerface for frictional contact with the outer face of the correspondingfriction shoe 24. Extending outwardly from the upper end of each wearlineris' a shoulder 26 which fits into a correspondingly recessed part21 of the shelf I1 and thus prevents movement of the liner downwardly.

It will be seen that each side frame assembly consists of two frictionsystems, spaced apart from each other and arranged lengthwise of theside frame. Between these two friction systems and above them is thecentral one of the three upper springs 20.

In order to prevent any upward movement of the four wear liners and tohold them tightly in place, I provide a special hold-down clamp 28, asshown in detail in Figure 4 and assembled in Figures 1, 2 and 3. Thisclamp is roughly rectangular in shape with each of its four corners 28aoverlying a part of one of the wear liners 25 and resting thereon. Thecentral part of the clamp is depressed at 281) and forms the seat forthe lower end of the center one of the springs 20. The thickness of thebody of the clamp is so adjusted with respect to the depth of therecesses 21 in shelf I1 and the thickness of the support shoulders 26 ofthe wear liners 25, that the clamp is supported entirely upon the fourwear liners. The entire reaction of the center one of the springs 20 istherefore effective in holding the four wear liners securely in place.The top surface of the spring seat in part 28b of the clamp is solocated with respect to the top surface of the wear liners upon whichthe clamp rests, that the top surface of part 281) is level with thesurface of the spring seating portion I! of the side frame. Thus allthree springs 29 are compressed the same amount by the bolster.

The ends of clamp 28 are relieved at 28c to clear the inner and outerbolster springs 20 and the sides of the clamp are recessed or notched at28d to clear the friction shoes 24.

It will thus be seen that I have provided a truck spring suspensionconsisting of five springs, all acting in parallel to support thebolster. Three of these springs support the bolster directly, while theother two support the bolster through friction generating means.

The terms and expressions which I have employed are used as terms ofdescription and not of limitation, and I have no intention, in the useof such terms and expressions, of excluding any equivalents of thefeatures shown and described or portions thereof, but recognize thatvarious modifications are possible within the scope of the inventionclaimed.

What I claim is:

1. In a railway car truck, a side frame and a bolster, spring seats onsaid side frame and bolster, said side frame having a depressed portionbetween said side frame spring seats, friction members in said depressedportion, spring-actuated friction shoes engaging said members, anelement seated in said depressed portion between said friction membershavingprojections overlying said friction members to limit upwardmovement thereof upon upward movement of said friction shoes, a springseat portion on said element and a spring seat portion on said bolsterdirectly above said element, the distance between said spring seatportions being substantially the same as the distance between said sideframe and bolster spring seats.

2. In a railway car truck, a side frame and a bolster, said side framehaving a shelf with a pair of openings therein and a depressed portion,friction members supported by said shelf, a spring seat element in saiddepressed portion between said openings having portions thereof engagingupper surfaces on said friction members, and a spring resting on saidelement andsupporting said bolster adapted with said element to restrainupward movement of said friction members.

3. In a railway car truck, a side frame and'a bolster, said side framehaving a shelf with a depressed central portion, friction memberscarried by said side frame having portions thereof received in saiddepressed central portion, spring means on said shelf on each side ofsaid depressed central portion a spring seat element in said depressedcentral portion having a spring engaging surface on the same level asthe upper surface of said shelf and having means thereon engaging uppersurfaces on said friction members, and a spring resting on said surfaceand supporting said bolster adapted with said element to restrain upwardmovement of said friction members.

4. In a railway car truck, a side frame and a bolster, said side framehaving a shelf with a depressed central portion, friction memberscarried by said side frame having portions thereof received in saiddepressed central portion, spring means on said shelf on each side ofsaid depressed central portion, a spring seat element in said depressedcentral portion having a spring seating Surface on substantially thesame level as the spring engaging surface of said shelf, said elementhaving means thereon adapted to engage said friction members to restrainupward movement thereof.

5. A side frame for a railway car truck, said side frame having a shelfwith a depressed central portion, spring seats on each side of saidcentral portion, friction members supported by said shelf havingportions received in said depressed central portion, and a spring seatmember in said central portion having lugs overlying said frictionmembers and having a spring seating portion at substantially the samelevel as said spring seats.

6. A spring seat member for railway car truck comprising a seatinportion adapted to receive a bolster supporting spring, an upstandingflange on said member on each side of said seating portion adapted toposition said spring and a plurality of lugs extending laterall fromsaid seating portion, the under surfaces of said lugs beingsubstantially in the same horizontal plane as said seating portion whensaid member is assembled in a car truck, sai-d surfaces each beingadapted to engage a friction member of a friction system to limit upwardmovement of the friction members.

JAMES A. SHAFER.

